- Add mode switching for timeline panel with ?mode=expert or ?mode=simple
- Expert mode displays all event types with system events as secondary (smaller, greyed)
- Simple mode shows only person-relevant events: ZoneTransition, FallDetected, AnomalyDetected, SleepSessionEnd, zone_entry/exit, portal_crossing, fall_alert, anomaly, security_alert
- Backend defaults to expert mode when mode parameter is empty or invalid
- Frontend syncs dashboard mode with SpaxelSimpleModeDetection for mode changes
- Add CSS styling for new event types (ZoneTransition, FallDetected, AnomalyDetected, sleep_session_end)
- Update isValidEventType to include new event types
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